Is CVE-2026-48554 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-48554?

CVE-2026-48554 has a CVSS v3 severity of HIGH (7.5).

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CVE-2026-48554

Description

Nagios Core before 4.5.14 and Nagios XI before 2026R1.7 are vulnerable to authenticated remote code execution via unfiltered NOTIFICATION-family macro substitution through the com_data parameter. When a notification command references $NOTIFICATIONCOMMENT$ or $NOTIFICATIONAUTHOR$ in a shell-reachable position, authenticated UI users can run arbitrary commands as the nagios user. Exploitation requires a non-default configuration in which a notification command references these macros in a shell-executed command line.